The Lua target enables the following define flags for the Haxe complier:
-D lua-ver Enable special features for a specific Lua version. Currently, this flag will enable extern methods that are specific to certain versions (e.g. table.pack in Lua > 5.2).-D luajit Enable special features for LuaJIT. Currently this flag will enable the jit and ffi module namespaces.-D lua-vanilla Generate code lacking some functionality (e.g. UTF-8) but with no additional library dependencies.